医学影像学杂志
醫學影像學雜誌
의학영상학잡지
JOURNAL OF MEDICAL IMAGING
2014年
6期
929-933
,共5页
马荣希%李晓辉%孙伯章%李林萌
馬榮希%李曉輝%孫伯章%李林萌
마영희%리효휘%손백장%리림맹
冠状动脉疾病%256层螺旋C T%冠状动脉造影术%图像质量%辐射剂量
冠狀動脈疾病%256層螺鏇C T%冠狀動脈造影術%圖像質量%輻射劑量
관상동맥질병%256층라선C T%관상동맥조영술%도상질량%복사제량
Coronary arterial disease%256-slice CT%Conventional coronary angiography%Radiation dose%Image quality
目的:探讨256层螺旋C T低管电压、低对比剂用量(“双低”)扫描在冠状动脉疾病诊断中的应用价值。方法52例临床疑诊冠状动脉疾病于本院行256层螺旋CT前瞻性心电门控冠状动脉成像双低扫描(管电压80kV ,对比剂用量0.8ml/kg)的患者资料(A组),均采用迭代重建算法iDose 5进行图像重建;50例行64层螺旋CT常规冠状动脉成像的患者资料作为对照组(B组),两组患者均行传统冠状动脉血管造影(CCG )检查。2名有经验的放射科医师按照15段分段法采用4级图像质量评分法评价两组患者的冠状动脉图像质量,并记录对比剂用量及辐射剂量,以CCG为准,评估两组冠状动脉C T成像的诊断准确率。结果所有患者均成功完成256层C T及64层C T 冠状动脉成像。A组患者共显示冠状动脉677节段,以CCG为标准,敏感度为94.5%,特异度为97.4%,阳性预测值为92.7%,阴性预测值为98.0%,诊断准确率为96.6%。B组冠脉成像患者共显示冠状动脉631节段,敏感度为89.1%,特异度为96.4%,阳性预测值为89.9%,阴性预测值为96.1%,诊断准确率为94.5%。两组患者的平均对比剂用量分别为56.8ml和82.2ml ,辐射剂量分别为1.46mSv和8.37mSv。结论256层螺旋CT低管电压冠脉成像技术结合低对比剂用量及迭代重建算法可实现冠状动脉成像的“双低”扫描,与CAG对比有很好的一致性。
目的:探討256層螺鏇C T低管電壓、低對比劑用量(“雙低”)掃描在冠狀動脈疾病診斷中的應用價值。方法52例臨床疑診冠狀動脈疾病于本院行256層螺鏇CT前瞻性心電門控冠狀動脈成像雙低掃描(管電壓80kV ,對比劑用量0.8ml/kg)的患者資料(A組),均採用迭代重建算法iDose 5進行圖像重建;50例行64層螺鏇CT常規冠狀動脈成像的患者資料作為對照組(B組),兩組患者均行傳統冠狀動脈血管造影(CCG )檢查。2名有經驗的放射科醫師按照15段分段法採用4級圖像質量評分法評價兩組患者的冠狀動脈圖像質量,併記錄對比劑用量及輻射劑量,以CCG為準,評估兩組冠狀動脈C T成像的診斷準確率。結果所有患者均成功完成256層C T及64層C T 冠狀動脈成像。A組患者共顯示冠狀動脈677節段,以CCG為標準,敏感度為94.5%,特異度為97.4%,暘性預測值為92.7%,陰性預測值為98.0%,診斷準確率為96.6%。B組冠脈成像患者共顯示冠狀動脈631節段,敏感度為89.1%,特異度為96.4%,暘性預測值為89.9%,陰性預測值為96.1%,診斷準確率為94.5%。兩組患者的平均對比劑用量分彆為56.8ml和82.2ml ,輻射劑量分彆為1.46mSv和8.37mSv。結論256層螺鏇CT低管電壓冠脈成像技術結閤低對比劑用量及迭代重建算法可實現冠狀動脈成像的“雙低”掃描,與CAG對比有很好的一緻性。
목적:탐토256층라선C T저관전압、저대비제용량(“쌍저”)소묘재관상동맥질병진단중적응용개치。방법52례림상의진관상동맥질병우본원행256층라선CT전첨성심전문공관상동맥성상쌍저소묘(관전압80kV ,대비제용량0.8ml/kg)적환자자료(A조),균채용질대중건산법iDose 5진행도상중건;50례행64층라선CT상규관상동맥성상적환자자료작위대조조(B조),량조환자균행전통관상동맥혈관조영(CCG )검사。2명유경험적방사과의사안조15단분단법채용4급도상질량평분법평개량조환자적관상동맥도상질량,병기록대비제용량급복사제량,이CCG위준,평고량조관상동맥C T성상적진단준학솔。결과소유환자균성공완성256층C T급64층C T 관상동맥성상。A조환자공현시관상동맥677절단,이CCG위표준,민감도위94.5%,특이도위97.4%,양성예측치위92.7%,음성예측치위98.0%,진단준학솔위96.6%。B조관맥성상환자공현시관상동맥631절단,민감도위89.1%,특이도위96.4%,양성예측치위89.9%,음성예측치위96.1%,진단준학솔위94.5%。량조환자적평균대비제용량분별위56.8ml화82.2ml ,복사제량분별위1.46mSv화8.37mSv。결론256층라선CT저관전압관맥성상기술결합저대비제용량급질대중건산법가실현관상동맥성상적“쌍저”소묘,여CAG대비유흔호적일치성。
Objective To evaluate the application of 256-slice CT coronary angiography (CTCA) at reduced tube voltage and contrast medium dose .Methods 52 patients suspected with coronary arterial disease underwent 256-slice CTA (tube voltage 80 kV ,contrast medium dose 0 .8 ml/kg) ,the images were post-processed with an iterative reconstruction algo-rithm level of iDose 5(group A);A control group of 50 patients underwent 64-slice CTA (group B) .Two groups were performed with conventional coronary angiography (CCG) .A 4-point scale was used for grading the overall image quality by 2 experienced radiologists .The sensitivity ,specificity ,positive predictive value (PPV) ,negative predictive value (NPV) and accuracy of CTA were evaluated .The radiation dose and contrast medium dose were recorded .Results Diag-nostic CTA images were obtained in all patients .677 diagnostic coronary segments were evaluated in group A ,the sensi-tivity ,specificity ,PPV ,NPV and accuracy were 94 .5% ,97 .4% ,92 .7% ,98 .0% and 96 .6% ,respectively .631 diag-nostic segments were evaluated in group B ,the sensitivity ,specificity ,PPV ,NPV and accuracy were 89 .1% ,96 .4% , 89 .9% ,96 .1% and 94 .5% ,respectively .The mean dose of contrast medium was 56 .8 ml for group A and 82 .2 ml for group B .The mean effective dose was 1 .46 mSv for group A and 8 .37 mSv for group B .Conclusion Combined use of low tube voltage ,low contrast medium dose and iterative reconstruction algorithm is more effective for reducing radiation dose and maintaining image quality in 256-slice CT coronary angiography .